I would definitely recommend 28/1.8 if it was at least as good as 85/1.8 (which is sharp at f/1.8 and is like $100 cheaper). My point is - 5D3 deserves an L glass . Why buy an excellent FF camera and then put a not-so-good lens on it? I'd say, if you can't wait, then buy a used 28/1.8 till you get the money for 35L and then sell it for the same $ you paid for it.
Higher ISO does not compensate for narrower aperture, it's a compromise. Otherwise, why bother with primes if one doesn't care about DoF control?
I see your point - 35 f/1.4 L is a stellar one. And 5D Mk III deserves that. But if he doesnt want to splash so much on 35L the 28 f/1.8 is a nice lens. Or he can buy used 35L to save some cash.
I know that higher ISO doesnt compensate for narrower appreture - Im sorry I meant this as compromise 28 f/1.8 USM lacks contrast on 1.8 and is softer - stopping down to 2.2 helps a lot.
I understand . I would love to have 35L on my 5D2, unfortunately there are some other expensive things I need to buy atm. So I may end up with Samyang for the summer, or longer if I like it .
I hope that Sigma will start producing their own 35/1.4 EX DG HSM soon and force Canon to wake up and do something about their outdated glass. Looks like Sigma 30/1.4 EX DC HSM wasn't enough, we need something for FF .